The other commands were good, but they included packages that were installed and then removed.
This command only shows packages that are currently installed, sorts smallest to largest, and formats the sizes to be human readable.

Calculates the size on disk for each package installed on the filesystem (or removed but not purged). This is missing the
| sort -rn
which would put the biggest packges on top. That was purposely left out as the command is slightly on the slow side
Also you may need to run this as root as some files can only be checked by du if you can read them ;)
Show Sample Output

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